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qt_reset_sensing()
The host application (optionally) calls “qt_reset_sensing( )”
to reset all channels and touch sensing parameters to their
default states. This step is only required if the host wants to
dynamically reconfigure the library at runtime
qt_enable_xxx()
The host application calls “qt_enable_key( )”, “qt_enable_rotor( )”
and/or “qt_enable_slider()” as required to configure the touch
sensors
qt_init_sensing()
The host application calls qt_init_sensing() to calibrate all the
configured channels and prepare the sensors for capacitive
measurement
qt_set_parameters()
The host application qt_set_parameters() to initialize the threshold
parameters for the library. If the user needs to change the thresholds,
edit the global data structure qt_config_data prior to calling this API
init_timer_isr()
The host application initializes the timer module required for
capacitive measurement
qt_measure_sensors()
The host application periodically calls
“qt_measure_sensors( )” to make capacitive measurements.
Yes
Time-critical host
application code
Part of host application
which cannot wait till multiple
measurements are complete (should
be as minimal as possible)
Check if multiple measurements are needed or not:
Is
QTLIB_BURST_A
GAIN=1
To resolve calibration
To resolve DI
To resolve positive recalibration
To compensate for drift
No
check qt_touch_status
check the global status variable “qt_touch_status” to see if any
sensors are in detect, and the angle or position of any enabled
rotors or sliders
Non-Time critical host application code
Host application which can be executed after
the completion of multiple measurements
for all the channels
Figure 5-6: Sequence of operations to add Touch capability
35
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